Because the Moon has no light of its own, it must rely on the Sun to provide its familiar white glow at night.
As the moon orbits the Earth for the whole month, different amounts of its side facing the planet are illuminated.
This translates into four distinct phases of the moon: the invisible New Moon, the First Quarter Moon, the illuminated Full Moon and the third quarter Moon.
Between these four phases, you will notice that the Moon takes on a crescent shape, particularly just before and after the New Moon.
The NASA space agency explained: "The moonlight is the sunlight that bounces off the surface of the Moon.
"As the Moon orbits around the Earth, the Sun is illuminated on any side of the Moon facing it, for the sun, it is always a full moon."
When is the Full Moon of October?
The full moon will fully light up next week, in the afternoon hours of Wednesday, October 24th.
NASA said the Moon will reach its peak brightness at 5.45 pm UK time (16.45 UTC or 12.45pm EDT).
But astronomers hoping to see the moon will have to keep their exact position in mind and adapt accordingly.
For example, if you look from London, the Moon will not rise beyond the horizon until 18.66 BST.
Further north, in Glasgow, Scotland, the moonrise should occur ten minutes later.
Someone watching the Moon from Rome, Italy, will have to wait until 6.45 pm local time and Moscow will not see the full moon until 7.45 pm local time.
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NASA said the Moon will be full for about three days, which means that the day before and after the Full Moon, it will be very difficult to see a difference in lighting.
The space agency said: "In lunisolar calendars the months change with the New Moon and the Full Moon falls in the middle of the lunar month.
"This Full Moon falls towards the middle of the ninth month of the Chinese calendar and Marcheshvan in the Jewish calendar.
"Nell & # 39; Islam calendar the months begin with the first sighting of the crescent moon rising a few days after the New Moon. "
What is the meaning of the Full Moon of October?
Passionate astronomers may recognize the full moon in October as the so-called Full Hunter's Moon or simply Hunter's Moon.
The name derives from the Algonquin Native American tribes who named the different phases of the Moon to keep track of time.
NASA said: "According to the Farmer's Almanac, with the falling leaves and the fattened fallow deer, it's time to hunt.
"Because the harvesters have harvested the fields, hunters can easily see the animals that have come to glean.
"The first use of the term & # 39; Hunter & # 39; s Moon & # 39; mentioned in the Oxford English Dictionary is from 1710."
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